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10 Best Aquarium Heater For 5 Gallon Tank 2025 in the United States
#1
Winner
Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks
The Orlushy 25W Small Submersible Aquarium Heater is designed for small tanks, making it suitable for 5-gallon aquariums. With a compact size of 4.7 inches, it is ideal for low water levels and can be easily concealed within the tank. This heater operates with a preset temperature of 78℉ and maintains this temperature with an accuracy of ±3℉, ensuring a stable environment for your fish.
Rating
9.8
Chosen by1,388
Adjustability
Ease of Installation
Most important from
23421 reviews
#2
Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black
The Fluval E200 Advanced Electronic Heater is a high-performance heater designed for aquariums up to 65 gallons, which is much larger than the 5-gallon tank you need. It has a 200-watt output, which is significantly more powerful than necessary for a small tank and could potentially cause overheating issues.
Rating
9.6
Wattage
Safety Features
Most important from
1427 reviews
Top 10 Best Aquarium Heater For 5 Gallon Tank 2025 in the United States
#1
Winner
9.8 score
Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks
Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks
Wattage: 25W
Size and Shape: 4.7 inches
Safety Features: Heat-resistant ABS, non-corrosive glass
Ease of Installation: Straightforward
Chosen by 1388 this week
Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black
Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black
Wattage: 200 watts
Adjustability: Dual sensors, LCD, 68-93°F range
Size and Shape: 2"D x 1.25"W x 13.75"H
Safety Features: Shut-off, fish guard
Ease of Installation: Mounting bracket, easy install
Orlushy 25W Submersible Mini Fish Tank Heater, Adjustable Aquarium Heater with Digital Display External Controller, Overheat Protection and Free Thermometer for 1-5 Gallon Freshwater & Saltwater Tank
Orlushy 25W Submersible Mini Fish Tank Heater, Adjustable Aquarium Heater with Digital Display External Controller, Overheat Protection and Free Thermometer for 1-5 Gallon Freshwater & Saltwater Tank
Wattage: 25W
Adjustability: 65℉ to 93℉, 1℉ steps
Size and Shape: 5.2 inches, compact
Safety Features: Heat resistance, explosion-proof, auto power off
Ease of Installation: Straightforward
Related Products
Fluval M 50-Watt Submersible Heater
Fluval M 50-Watt Submersible Heater
Wattage: 50 watts
Adjustability: easy-to-adjust control dial
Size and Shape: 1.8 x 4.8 x 14.8 inches
Safety Features: shock-resistant glass, ceramic heat sink
Ease of Installation: slim profile, easy to install
Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon
Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon
Wattage: 50 watts
Adjustability: No
Size and Shape: 5.25 x 1.62 x 3.5 inches
Safety Features: Automatic shut-off
Ease of Installation: Straightforward
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Buying Guide for the Best Aquarium Heater For 5 Gallon Tank
Choosing the right aquarium heater for your 5-gallon tank is crucial to maintaining a stable and healthy environment for your fish. The heater ensures that the water temperature remains consistent, which is vital for the well-being of your aquatic pets. When selecting a heater, you need to consider several key specifications to ensure it meets the needs of your tank and its inhabitants. Here’s a guide to help you understand what to look for and how to make the best choice.WattageWattage refers to the power output of the heater and determines how effectively it can heat the water in your tank. For a 5-gallon tank, a heater with a wattage of 10-25 watts is typically sufficient. Lower wattage heaters (10-15 watts) are suitable for maintaining temperatures in warmer rooms, while higher wattage heaters (20-25 watts) are better for cooler environments or if you need to raise the temperature significantly. Choose a wattage based on the ambient room temperature and the specific needs of your fish.
AdjustabilityAdjustability refers to the ability to set and control the temperature of the heater. Adjustable heaters allow you to set a specific temperature, which is important if you have fish that require precise temperature ranges. Non-adjustable heaters are preset to a fixed temperature, usually around 78°F, which is suitable for most tropical fish. If you have species with specific temperature needs, an adjustable heater is the better choice. Otherwise, a non-adjustable heater can be a simpler and more cost-effective option.
Size and ShapeThe size and shape of the heater are important to ensure it fits comfortably in your 5-gallon tank without taking up too much space or obstructing other equipment. Compact and slim heaters are ideal for small tanks as they can be easily concealed and do not interfere with the tank’s aesthetics or the swimming space of your fish. Make sure to measure your tank and check the dimensions of the heater to ensure a good fit.
Safety FeaturesSafety features such as automatic shut-off, shatterproof construction, and overheating protection are important to prevent accidents and ensure the longevity of the heater. Automatic shut-off turns the heater off if it overheats or if the water level drops too low, preventing damage and potential hazards. Shatterproof construction ensures the heater can withstand accidental bumps or drops. Look for heaters with these safety features to provide a secure environment for your fish.
Ease of InstallationEase of installation refers to how simple it is to set up the heater in your tank. Heaters that come with clear instructions, suction cups, or mounting brackets are easier to install and position correctly. This is especially important in a small tank where space is limited. Choose a heater that you can easily install and adjust as needed to ensure it operates efficiently and maintains the desired temperature.